US7128518B2 - Working vehicle - Google Patents

Working vehicle Download PDF

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Publication number
US7128518B2
US7128518B2 US11/102,637 US10263705A US7128518B2 US 7128518 B2 US7128518 B2 US 7128518B2 US 10263705 A US10263705 A US 10263705A US 7128518 B2 US7128518 B2 US 7128518B2
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United States
Prior art keywords
arm
vehicle
lift
vehicle according
arms
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Expired - Fee Related
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US11/102,637
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US20050196262A1 (en
Inventor
Masaaki Yamashita
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Yanmar Co Ltd
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Yanmar Co Ltd
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Publication of US20050196262A1 publication Critical patent/US20050196262A1/en
Assigned to YANMAR CO., LTD. reassignment YANMAR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMASHITA, MASAAKI
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • E02F3/3405—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • E02F3/3414—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines the arms being pivoted at the rear of the vehicle chassis, e.g. skid steer loader
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • E02F3/342—Buckets emptying overhead

Definitions

  • the present invention relates to a working vehicle, such as a skid steer loader, which can work in a narrow space, and especially relates to a structure of lift arms extended forward from the rear part of the vehicle.
  • skid steer loader which can turn on a small circle with driving wheels by operating steering levers provided in an operation control portion so as to carry out loading and dumping work in a limited space.
  • the skid steer loader is equipped on a side portion thereof with a lift arm, which is formed in an approximate inverse L-shape in a side view, and extended forward from a rear portion of the vehicle.
  • the lift arm can lift up and down a working machine, such as a bucket, attached on a front end of the arm, in the almost vertical direction relative to the ground.
  • Such a skid steer loader is desired to have a sufficiently long bucket reach when the lift arm is lifted up at an uppermost position.
  • the vehicle requires a bracket to support the lift arm.
  • the bracket tends to be a big structure so as to have enough strength.
  • a bigger bracket is needed for a longer bucket reach.
  • a big bracket sometimes obstructs an operator's rear or side view from the operation control portion so badly that the operator feels difficulty in backing and turning operation of the vehicle.
  • JP-Hei6(1994)-33476 a conventional type skid steer loader is disclosed in JP-Hei6(1994)-33476, in which the operator's side view is improved without increasing the number of needed links.
  • the lift arm while being lifted up, moves away from the vehicle body so as to have a bad influence on the skid steer loader in its fore-and-aft balance and its loading and dumping work, because the arm is integrally formed between its ends pivoted onto the bracket and the working machine, so as to have a constant angle bend.
  • JP-Hei11(1999)-158905 discloses a conventional art relating to a skid steer loader, in which an operator doesn't have to move the vehicle back and forth so much in dumping stuff loaded on a bucket onto a truck etc. Furthermore, according to the document, some other problems are also solved to improve operability of loading and dumping work. For example, the vehicle is prevented from lurching backward when the bucket is being lifted up.
  • the above conventional skid steer loader is configured in such a way that the bucket is positioned at the forefront of the vehicle when the lift arm is lifted up at an uppermost position. Therefore, the vehicle tends to lose balance in dumping stuff loaded on the bucket onto a truck etc.
  • JP-2001-64990 discloses a skid steer loader which is equipped with a slidable arm on a main arm of a lift arm.
  • the slidable arm is slidable against the main arm so that a bucket provided thereon should move on a demanded locus, such as a vertical line, a circular arc, etc. in loading and dumping work.
  • skid steer loader has a complex mechanism and is expensive in exchange for having a desired bucket locus because it needs additional elements, such as sensors for detecting a distance slid by the slidable arm and a tilt angle of the bucket, controllers for controlling the lift arm on the basis of detection values, and several control valves.
  • the present invention aims for providing a skid steer loader which secures a wide rear and side view field for an operator in an operation control portion, and which keeps stable balance even when a lift arm is lifted up at an uppermost position.
  • the present invention also aims for providing a simple mechanism for lifting up the lift arm keeping an opening of a bucket face almost upward.
  • a working vehicle comprises: a bracket stood on a rear portion of a vehicle body; a lift arm vertically turnably provided on the bracket and extended forward; a working machine attached on the lift arm before the vehicle body.
  • the lift arm includes a rear-side first arm and a front-side second arm, whereby a distance from a basal end of the first arm to a front end of the second arm can be varied. Therefore, the lift arm can be lifted up keeping it as close to the vehicle body as possible. Also, an enough bucket reach can be secured when the lift arm is lifted up at an uppermost position thereof.
  • a swing motion-limiting member is interposed between the bracket and the second arm so that an angle of bend formed by the first arm and the second arm is set to be large at a lowered position of the lift arm and small at a lifted position, whereby the lifted-up working machine can extremely approach the vehicle body. Therefore, an enough bucket reach can be secured at a lifted-up position of the working machine.
  • a pivot joint portion between the first arm and the vehicle body substantially corresponds to the rear end of an operation control portion, so that the bracket supporting the lift arm is positioned behind the operation control portion and prevented from obstructing an operator's side view. Furthermore, an operator's view from the operation control portion is highly improved when the lift arm is lifted up at the uppermost position thereof while securing an enough bucket reach.
  • a swing motion-limiting member is interposed between the bracket and the second arm so that an angle of bend formed by the first arm and the second arm is set to be large at a lowered position of the lift arm and small at a lifted-up position, whereby the working machine is kept close to the vehicle body during being lifted-up. Therefore, an enough bucket reach can be secured at the lifted-up position of the working machine.
  • the swing motion-limiting member is a rod, one end of the rod being joined to a portion above a pivot joint portion between the first arm and the bracket, and the other end of the rod being joined to a portion below a pivot joint portion between the first arm and the second arm.
  • This configuration achieves an easy and economical way for the angle of bend formed by the first arm and the second arm.
  • the rod and the first arm are disposed substantially parallel to each other, thereby minimizing a hidden area of the operator's side view when the lift arm is lifted up.
  • a cylinder for the working machine is disposed on a side of the second arm opposite to the vehicle body, and a tip end of the cylinder is connected to the working machine and the second arm via links, whereby an angle range of swing of a bucket can be increased without deteriorating an operator's view from the operation control portion. Therefore, an enough bucket dump angle is secured even at an uppermost position of the bucket.
  • a cylinder for the working machine is disposed on a side of the second arm opposite to the vehicle body, and a basal portion side of the cylinder is connected to a tip end of the first arm, whereby the angle of bend between the first arm and the second arm varies automatically as the lift arm is lifted up. Therefore, the bucket can be automatically leveled without any additional component.
  • the lift arms are provided in a left and right pair, and a cross member is spanned between ends of the first arms so as to increase rigidity of the lift arms. Therefore, the first arms never bend even when an imbalanced load is applied on the bucket.
  • the cross member is in a U shape in a front view, whereby rigidity of the first arms is increased without obstructing an operator getting on and off the vehicle.
  • a nonskid pad for getting on and off the vehicle is provided on an upside of a lateral center portion of the cross member, whereby an operator can stably get on and off the operation control portion.
  • the lift arms are provided in a left and right pair, and a cross member is spanned between the left and right second arms, whereby the second arms never bend even when an imbalanced load is applied on the bucket.
  • a rubber crawler is employed for a traveling system of the working vehicle, whereby grounding pressure is decreased. Therefore, the vehicle can have good running performance even on a damp ground, or on a soft road.
  • FIG. 1 is a side view of a skid steer loader as an example of a working vehicle according to the present invention showing an overall structure thereof.
  • FIG. 2 is a side view of the skid steer loader showing comparison between an angle of bend A of a lift arm at a lowermost position thereof and an angle of bend B of the lift arm at an uppermost position thereof.
  • FIG. 3 is a side view of the skid steer loader showing a range of swing of a bucket at the uppermost position of the lift arm.
  • FIG. 4 is a side view of the skid steer loader showing a structure of a lift arm according to a second embodiment and a lifting-up course thereof.
  • FIG. 5 is a side view of the skid steer loader showing a configuration of a cross member.
  • FIG. 6 is a front view showing the configuration of the cross member.
  • FIG. 7 is an overall side view of a skid steer loader having a rubber crawler.
  • the skid steer loader is provided on a lower portion of a body 1 thereof with front wheels 2 a and 2 a and rear wheels 2 b and 2 b , and provided inside a rear portion of body 1 with an engine 3 .
  • An operation control portion is disposed on a front portion of body 1 , where operation levers, operation pedals, a seat, etc. are provided. Left and right sides of the operation control portion are covered with net guards 5 and 5 , stood on either side of body 1 , and with a roof 6 , fixed on tops of net guards 5 and 5 .
  • the operation control portion has a front opening, through which an operator enters the operation control portion and sits on a seat therein for various operations.
  • Brackets 8 and 8 which are triangle-shaped in a side view, are provided upright on respective left and right sides of the rear portion of body 1 .
  • a lift arm 9 is pivoted on an upper portion of each bracket 8 and extended forward.
  • a front portion of each lift arm 9 is bent in an approximate inverse L-shape.
  • a working machine, such as a bucket 10 is mounted on tip ends of lift arms 9 and 9 .
  • the operation control portion is provided therein with left and right steering levers (not shown) for independently controlling rotation of respective left and right front wheel 2 a and rear wheel 2 b . Therefore, a traveling direction of the vehicle can be changed by differentiating rotational speed between the left pair of front and rear wheels 2 a and 2 b and the right pair of front and rear wheels 2 a and 2 b . Furthermore, the vehicle can spin by driving the left pair of wheels 2 a and 2 b and the right pair of wheels 2 a and 2 b in opposite directions.
  • a single steering lever, a steering wheel or the like can be used for steering operation instead of the above-described left and right steering levers.
  • left and right pedals can be used instead of the left and right steering levers.
  • a pair of levers can be provided, one of which is used for steering operation, and the other of which is used for operation of the lift arms, the bucket, etc.
  • pedals can be used for steering operation or for operation of the lift arms, the bucket, etc.
  • each lift arm 9 includes two arms, namely, front and rear arms with a bending portion 9 a between them.
  • the rear arm is designated as a first arm 11
  • the front arm as a second arm 12 .
  • first arm 11 is disposed substantially horizontally with respect to the ground, and second arm 12 in the initial position (when not worked) is disposed vertically with respect to the ground, so that lift arm 9 looks like an inverse L shape in a side view.
  • First arm 11 is pivoted at the basal (rear) side portion thereof onto an upper portion of bracket 8 with a pin 32 .
  • Pin 32 which serves as a turning center axis of lift arm 9 , is disposed above an axle 2 c of rear wheel 2 b.
  • Each second arm 12 is longitudinally turnably pivoted at the basal portion thereof onto the forefront portion of first arm 11 with a pin 30 .
  • a joint portion between the basal side of first arm 11 and the upper portion of bracket 8 substantially corresponds to a rear end portion of the operation control portion in the fore-and-aft direction. Furthermore, the joint portion is positioned lower than the level of an operator's eyes. Therefore, when lift arm 9 is lowered, it is positioned below the operator's view so that it doesn't obstruct the operator's view.
  • a lift cylinder 13 is provided below first arm 11 .
  • Lift cylinder 13 is pivoted at a rear end thereof onto a portion of bracket 8 forward and downward from pin 32 .
  • lift cylinder 13 is pivoted at a front end thereof onto a jutting portion 11 a , jutting downward from a bottom portion on the front side of first arm 11 , and lift cylinder 13 is disposed substantially parallel to first arm 11 .
  • the pair of left and right first arms 11 are provided therebelow with respective lift cylinders 13 which are expanded and contracted by operating a control lever provided in the operation control portion.
  • First arms 11 are turned vertically (longitudinally) by expansion and contraction of lift cylinders 13 .
  • Vertical bucket cylinders 14 serving as actuators for driving a working machine, are provided on a side of respective second arms 12 opposite to body 1 , namely, the front side (or upper side when the lift arms are raised) of second arms 12 .
  • Each bucket cylinder 14 is pivoted at a basal portion thereof onto a stay 17 projecting forward from the base side of second arm 12 .
  • Bucket cylinder 14 is connected at the front end (lower end) side thereof to bucket 10 and the tip end of second arm 12 via links 21 and 22 . Description will be given of links 21 and 22 more in detail later.
  • bucket cylinders 14 are expanded and contracted so as to vertically turn bucket 10 attached on the tip ends of lift arms 9 , thereby adjusting a turning angle of bucket 10 .
  • a connecting rod 15 is interposed between bracket 8 and second arm 12 in such a way that rod 15 crosses first arm 11 in a side view.
  • Rod 15 serves as a swing motion-limiting member that limits an angle of bend of lift arm 9 while lift arm 9 is lifted up and down.
  • rod 15 is pivoted at a rear end thereof onto a triangular upper end portion 8 a of bracket 8 with a pin 31 .
  • a front end of rod 15 is pivotally joined to a stay 16 projecting backward (downward when lifted up) from an upper rear portion of second arm 12 .
  • Pin 31 with which rod 15 is pivotally joined to bracket 8 , is arranged rearward and upward from pin 32 , which serves as a pivot joint portion between first arm 11 and bracket 8 .
  • a pivot joint portion between rod 15 and stay 16 is disposed lower than pin 30 pivotally connecting first arm 11 and second arm 12 to each other.
  • rod 15 and first arm 11 cross each other while extending nearly parallel to each other (so that they cross each other at a very small angle), thereby reducing an occupied area of the side view from the operation control portion as much as possible, so as to be prevented from obstructing the operator's view when lift arm 9 is lifted up and down.
  • rod 15 is disposed on the proximal side of first arm 11 (toward the operation control portion) so as to be prevented from interfering with first arm 11 .
  • rod 15 and first arm 11 are arranged to cross each other, so that, when the lift arm is lifted up, first arm 11 is turned upward around the central axis of pin 32 , and second arm 12 , pivoted on a front end of first arm 11 with pin 30 , is simultaneously lifted up. Meanwhile, rod 15 turns upward around pin 31 . In the middle course of the turning of rod 15 , a locus 51 of pin 30 on the front end of first arm 11 crosses a locus 55 of pin 33 , which serves as a connecting axis between second arm 12 and rod 15 . During the upward turning, the angle of bend formed by first arm 11 and second arm 12 is gradually decreased from an angle A at a lowermost position of the lift arm to an angle B at an uppermost position.
  • the working machine can extremely approach the operation control portion, whereby an operator can easily view the position of working. Furthermore, the fore-and-aft length of the whole vehicle body can be shortened, thereby reducing a radius of a turning circle of the vehicle. Still further, an operator's side view from the operation control portion is improved.
  • each rod 15 is pivoted onto bracket 8 at a different position from the pivot joint portion between bracket 8 and first arm 11 , and is extended across first arm 11 and pivoted onto second arm 12 . Therefore, when lift arms 9 are lifted up, the angle of bend A formed by first arm 11 and second arm 12 is gradually decreased, and second arms 12 are turned forward, thereby lifting up bucket 10 to a high position. Further, mutually crossing first arm 11 and rod 15 extend nearly parallel to each other (so that they cross each other at a very small angle), thereby minimizing a hidden area of an operator's side view from the operation control portion.
  • a turnbuckle or the like may be used to change the length of each rod 15 so as to adjust the angle of bend of first arm 11 with respect to second arm 12 when lift arms 9 are lifted up and down.
  • cylinders or the like replacing rods 15 can be expanded and contracted so as to raise lift arms 9 with the best angle of bend for good weight balance and for preventing lift arms 9 from interfering with other components. As a result, lift arms 9 can be lifted up still higher.
  • Bucket 10 as a working machine is connected to the tip end of second arm 12 of each lift arm 9 via links 21 and 22 .
  • a pair of left and right triangular supporting stays 20 project from a rear portion of bucket 10 .
  • the tip end of second arm 12 is pivoted onto a lower rear end of each supporting stay 20 with a pin 35 .
  • the basal end of each bucket cylinder 14 is pivoted onto stay 17 with a pin 39 .
  • a tip of a piston rod of bucket cylinder 14 is pivoted onto one ends of link 21 and 22 with a pin 37 .
  • the other end of link 22 is pivoted onto an upper front portion of supporting stay 20 with a pin 36
  • the other end of link 21 is pivoted onto the tip end portion of second arm 12 with a pin 38 , nearer to the basal end of second arm 12 than pin 35 . Therefore, pins 37 , 38 , 35 and 36 are arranged in such a way that a line connecting them in this order forms an approximate parallelogram.
  • bucket 10 can turn around the central axis of pin 35 as bucket cylinders 14 are expanded and contracted.
  • the link mechanism around the bucket used for a backhoe etc. is provided on the tip ends of the lift arms so that a turning angle of the bucket can be increased without deteriorating the operator's view from the operation control portion. Furthermore, as shown in FIG. 3 , even when bucket 10 is lifted up at an uppermost position, the angle of bucket 10 is sufficient for dumping. To be more specifically, according to the present embodiment, a downward turning angle of about 45 degrees and an upward turning angle of about 140 degrees are secured for dumping, on the assumption that an initial angle of bucket 10 is taken when bucket 10 stays in parallel to the ground.
  • basal end portions of bucket cylinders 14 are fixed on tip ends of respective first arms 61 .
  • each first arm 61 is inclined backward (forward-upward when not in operation), and the basal portion of each bucket cylinder 14 is pivoted onto the front end of first arm 61 with a pin 40 , in comparison with the first embodiment, in which the basal portion of each bucket cylinder 14 is fixed onto stay 17 , projecting forward from the basal portion of second arm 12 .
  • a second arm 62 is pivoted with a pin 41 onto a portion of first arm 61 slightly backward from the tip end thereof, and rod 15 is pivoted onto stay 16 , projecting from the rear side of second arm 62 , similar to stay 16 in the first embodiment.
  • each lift arm 9 is gradually decreased as first arm 61 is lifted up, similar to that in the first embodiment. Furthermore, since each bucket cylinder 14 is supported at the tip end of first arm 61 , an opening of bucket 10 is turned upward following movement of lift arms 9 in the direction for decreasing the angle of bend thereof.
  • each first arm 61 is provided with a portion for supporting one side of bucket cylinder 14 , lift arm 9 can be lifted up keeping the opening of bucket 10 face almost upward in cooperation with change of the angle of bend formed by first arm 61 and second arm 62 . This means that bucket 10 can be automatically leveled without any additional component.
  • the angle of bend formed by arms 61 and 62 is controlled by driving cylinder 13 and by swing motion-limiting of rod 15 , so that the position of lift arms 9 (position M in FIG. 4 ) during lifting-up can be brought closer to the body side. At the same time, a sufficient bucket reach can be secured at a lifted-up position of the lift arms. It should be noted that the same thing happens in the vehicle according to the first embodiment.
  • a cross member 24 is spanned between front portions of left and right first arms 11 and 11 .
  • Cross member 24 is arranged in such a way that left and right vertical portions thereof extend substantially parallel to second arms 12 in a side view when the lift arms are at a lowered position. Both ends of cross member 24 are bent outward-upward and fixed onto proximal side surfaces of respective first arms 11 .
  • the fixed both ends of cross member 24 are positioned above respective stays 16 and 16 projecting from respective second arms 12 , so as to prevent cross member 24 from interfering with stays 16 and rods 15 pivoted on respective stays 16 .
  • a nonskid pad 25 made of a steel plate, a mat or the like, is provided on an upside surface of the lateral center portion of cross member 24 .
  • a left-and-right directed straight rod-like cross member 26 is spanned between (below) second arms 12 and 12 . Both ends of cross member 26 are fixed onto proximal side surfaces of second arms 12 and 12 .
  • cross member 24 is spanned between first arms 11
  • cross member 26 is spanned second arms 12 , so that both ends of respective cross members 24 and 26 are fixed to first arms 11 and second arms 12 .
  • first arms 11 and second arms 12 are increased in rigidity, so as to be prevented from bending even when an imbalanced load is applied thereon due to a heavy burden loaded on bucket 10 .
  • cross member 24 spanned between first arms 11 is formed in a U-shape, it is not obstructive to an operator getting on and off the operation control portion.
  • cross member 24 is disposed at a lower position, it is prevented from interfering with rods 15 , the stay fixed onto second arms 12 , etc.
  • nonskid pad 25 made of a steel plate, a mat, etc., is provided on the upside surface of the lateral center portion of cross member 24 , so that an operator can get on and off the operation control portion using nonskid pad 25 as a step.
  • the skid steer loader has the wheel type driving system.
  • it may have a crawler type driving system, like rubber crawlers 60 as shown in FIG. 7 .
  • the loader has lift arm 9 , the lifting mechanism of lift arm 9 and the other components on the upper part of the vehicle body, similar to the above structure, and has the crawler driving system replacing the wheel driving system.
  • Rubber crawler 60 is provided on a truck frame 63 extended in the fore-and-aft direction on each of opposite sides of the lower part of body 1 .
  • a driving wheel 64 is supported on an upper rear portion of truck frame 63 .
  • Trailing wheels 65 and 66 are rotatably disposed on lower front end and lower rear end of truck frame 63 , respectively. Free wheels 67 are disposed between trailing wheels 65 and 66 .
  • a crawler belt 68 is wound around driving wheel 64 , trailing wheels 65 and 66 and free wheels 67 , whereby the vehicle can be driven as well as a wheel-type vehicle. In this case, grounding pressure can be reduced, thereby beneficially obtaining large traction power.
  • the present invention provides a skid steer loader, having an enough wide field of vision for an operator. Furthermore, a working machine attached on the loader never inclines forward largely in lifting-up operation. Therefore, it can be used in construction work etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Shovels (AREA)
  • Jib Cranes (AREA)
  • Discharge Of Articles From Conveyors (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US11/102,637 2002-10-21 2005-04-11 Working vehicle Expired - Fee Related US7128518B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002-306252 2002-10-21
JP2002306252A JP3828856B2 (ja) 2002-10-21 2002-10-21 スキッドステアローダ
PCT/JP2003/013396 WO2004035944A1 (ja) 2002-10-21 2003-10-20 スキッドステアローダ

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/013396 Continuation WO2004035944A1 (ja) 2002-10-21 2003-10-20 スキッドステアローダ

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US20050196262A1 US20050196262A1 (en) 2005-09-08
US7128518B2 true US7128518B2 (en) 2006-10-31

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US (1) US7128518B2 (de)
EP (1) EP1559837B1 (de)
JP (1) JP3828856B2 (de)
CN (1) CN100429357C (de)
AT (1) ATE557137T1 (de)
AU (1) AU2003273063A1 (de)
WO (1) WO2004035944A1 (de)

Cited By (5)

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Publication number Priority date Publication date Assignee Title
US20110027056A1 (en) * 2009-07-29 2011-02-03 Cnh America Llc Vertical lift arm device
CN103147577A (zh) * 2013-02-27 2013-06-12 中联重科股份有限公司 多关节类机械臂架的控制方法、设备、系统及工程机械
US8827625B2 (en) 2010-08-25 2014-09-09 Cnh Industrial America Llc Load arm arrangement for a skid-steer loader
US20140271078A1 (en) * 2013-03-15 2014-09-18 Rodney Koch Lift arm structure with an articulated knee portion
US20150308072A1 (en) * 2014-04-28 2015-10-29 CNH Industrial America, LLC Lift assembly for a work vehicle

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JP4314368B2 (ja) * 2004-05-21 2009-08-12 ヤンマー建機株式会社 積込み装置
US7568878B2 (en) * 2005-07-22 2009-08-04 Frey Industries Limited Loader boom arm
US7354237B2 (en) * 2005-07-22 2008-04-08 Frey Industries Limited Loader boom arm
JP2007254986A (ja) * 2006-03-22 2007-10-04 Komatsu Ltd スキッドステアローダのリフトアーム
DE102006044533A1 (de) * 2006-09-21 2008-04-03 Wilhelm Stoll Maschinenfabrik Gmbh Frontlader mit mechanischer Parallelführung
JP4919869B2 (ja) * 2007-04-27 2012-04-18 株式会社アイチコーポレーション 作業車両
JP5119094B2 (ja) * 2008-09-03 2013-01-16 株式会社クボタ ローダ作業機
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JP5153553B2 (ja) * 2008-10-01 2013-02-27 Ｉｈｉ建機株式会社 建設機械
CN201317948Y (zh) * 2008-12-12 2009-09-30 湖南山河智能机械股份有限公司 滑移装载机动臂
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US20050196262A1 (en) 2005-09-08
EP1559837B1 (de) 2012-05-09
JP2004143668A (ja) 2004-05-20
JP3828856B2 (ja) 2006-10-04
AU2003273063A1 (en) 2004-05-04
CN1703558A (zh) 2005-11-30
EP1559837A1 (de) 2005-08-03
WO2004035944A1 (ja) 2004-04-29
ATE557137T1 (de) 2012-05-15
EP1559837A4 (de) 2011-01-05

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